if i just got 1 female molly and 1 male molly fish will they mate tonight?

i want to know how fast they will really mate. my female is small and my male is big i got them at 12:00 in the morning and it is now 6:41 PM i was wondering when they will mate like in a week or two days or maybe tonight. Im only gonna let them mate once so she will only carry the sperm through 3 births and then i will let her rest in a differeent aquarium.
 
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